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su ervision of EAT geologists. The borings were drilled to a <br /> depth of approximately 29 feet bgs using 8-inch outside diameter <br /> continuous flight hollow stem augers. All borings were logged <br /> in accordance with the Unified Soil Classification System (see <br /> Appendix A) . <br />' Soil samples were obtained from each boring beginning at <br /> approximately 5 feet bgs and at approximately 5-foot intervals <br /> thereafter until termination. The samples were collected using <br /> six 2 . 5-inch diameter by 3-inch long brass tube mounted within a <br /> 2 . 5-inch inside diameter split-spoon drive sampler employed in <br /> advance of the augers. After sample recovery, the ends of the <br />' lowermost 3-inch long tube were covered with aluminum foil and <br /> plastic caps taped over the ends. Prior to use, all tubes were <br /> washed in a solution of Alconox detergent and tap water, rinsed <br />' with tap water and then with distilled water. The samples were <br /> labeled with the sample point identification, depth interval, <br /> time and date, individually sealed in "Ziploc" plastic bags, and <br /> immediately placed into an ice chest chilled using crushed and <br />' frozen blue ice. The samples were kept chilled until delivered <br /> to the laboratory for analytical testing. All samples were <br /> logged on chain of custody record forms (see Appendix B) . <br /> An HNU Model DL-101 Photoionizer/Datalogger calibrated <br /> against an isobutylene gas standard was used on soil contained <br /> in the second tube from the bottom of the shoe, at each sampling <br /> interval within the borings to determine if volatile hydrocarbon <br /> vapors were emanating directly from the soil. Each sample was <br /> placed in an airtight "Ziploc" plastic bag. The samples were <br />' allowed to sit in the sun, and then the head space in the bags <br /> was analyzed using the HNU Photoionizer. The results of this <br /> testing were recorded on the boring logs (see Appendix A) . <br />' 2 . 2 SAMPLING EQUIPMENT CLEANING PROTOCOL <br />' All soil sampling equipment was decontaminated between each <br /> sampling by the following procedure: <br /> - All excess soil was scraped off the sampler parts; <br />' - The sampler was washed in a solution of Alconox detergent <br /> and tap water; and <br /> - The sampler was rinsed with tap water and then distilled <br /> water. <br /> Project No. 1232 -4- <br /> ENVIRONMENTAL AUPI T,INC® <br />